JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Json based Restful web service with RESTEasy and Jackson.


In this page you will see support for Json using RESTEasy and Jackson APIs. Jackson is is a multi-purpose Java library for processing JSON data format. Jackson aims to be the best possible combination of fast, correct, lightweight, and ergonomic for developers In this example we will convert Order object to json format.

Here is the pom.xml file.

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
    			http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>RestfulWebServices</groupId>
	<artifactId>RestfulWebServices</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<repositories>
    	<repository>
			<id>jboss</id>
			<url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
		</repository>
	</repositories>
	<dependencies>
		<dependency>
			<groupId>org.jboss.resteasy</groupId>
			<artifactId>resteasy-jackson-provider</artifactId>
			<version>2.3.7.Final</version>
		</dependency>
		<dependency>
			<groupId>org.jboss.resteasy</groupId>
			<artifactId>resteasy-jaxrs</artifactId>
			<version>2.3.7.Final</version>
		</dependency>
	</dependencies>
</project>

Web.xml file for your reference:

<web-app id="WebApp_ID" version="2.4"
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	    
   <!-- Auto scan REST service -->
	<context-param>
		<param-name>resteasy.scan</param-name>
		<param-value>true</param-value>
	</context-param>
	<listener>
		<listener-class>
			org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
		</listener-class>
	</listener>
	<servlet>
		<servlet-name>resteasy-servlet</servlet-name>
		<servlet-class>
			org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
		</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>resteasy-servlet</servlet-name>
		<url-pattern>/*</url-pattern>
	</servlet-mapping>
</web-app>

Our model class Order is annotated with required jackson annoations to support json transformation:

package com.java2novice.model;

import org.codehaus.jackson.annotate.JsonProperty;

public class Order {

	@JsonProperty("order-no")
	private int orderNo;
	
	@JsonProperty
	private String custmer;
	
	private String address;
	
	@JsonProperty("bill-amount")
	private String amount;
	
	
	public int getOrderNo() {
		return orderNo;
	}
	public void setOrderNo(int orderNo) {
		this.orderNo = orderNo;
	}
	
	public String getCustmer() {
		return custmer;
	}
	public void setCustmer(String custmer) {
		this.custmer = custmer;
	}
	
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	
	public String getAmount() {
		return amount;
	}
	public void setAmount(String amount) {
		this.amount = amount;
	}
	
}

Remember that our restful web service API returning json, so annotate your service method with @Produces and specify MIME type as application/jon.

package com.java2novice.restful;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import com.java2novice.model.Order;

@Path("/order-inventory")
public class OrderInventoryService {

	@GET
	@Path("/order/{orderId}")
	@Produces(MediaType.APPLICATION_JSON)
	public Order getUserById(@PathParam("orderId") Integer orderId){
		
		Order ord = new Order();
		ord.setOrderNo(orderId);
		ord.setCustmer("Java2Novice");
		ord.setAddress("Bangalore");
		ord.setAmount("$2000");
		return ord;
	}
}

Try below URL to get xml output:

http://localhost:8080/RestfulWebServices/order-inventory/order/1016

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Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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